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FFmpeg/libavcodec/ffv1.c

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  1. /*

  2.  * FFV1 codec for libavcodec

  3.  *

  4.  * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>

  5.  *

  6.  * This file is part of FFmpeg.

  7.  *

  8.  * FFmpeg is free software; you can redistribute it and/or

  9.  * modify it under the terms of the GNU Lesser General Public

  10.  * License as published by the Free Software Foundation; either

  11.  * version 2.1 of the License, or (at your option) any later version.

  12.  *

  13.  * FFmpeg is distributed in the hope that it will be useful,

  14.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  15.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  16.  * Lesser General Public License for more details.

  17.  *

  18.  * You should have received a copy of the GNU Lesser General Public

  19.  * License along with FFmpeg; if not, write to the Free Software

  20.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  21.  */

  22. 

  23. /**

  24.  * @file libavcodec/ffv1.c

  25.  * FF Video Codec 1 (an experimental lossless codec)

  26.  */

  27. 

  28. #include "avcodec.h"

  29. #include "get_bits.h"

  30. #include "put_bits.h"

  31. #include "dsputil.h"

  32. #include "rangecoder.h"

  33. #include "golomb.h"

  34. #include "mathops.h"

  35. 

  36. #define MAX_PLANES 4

  37. #define CONTEXT_SIZE 32

  38. 

  39. extern const uint8_t ff_log2_run[32];

  40. 

  41. static const int8_t quant3[256]={

  42.  0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  43.  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  44.  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  45.  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  46.  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  47.  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  48.  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  49.  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  50. -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,

  51. -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,

  52. -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,

  53. -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,

  54. -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,

  55. -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,

  56. -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,

  57. -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, 0,

  58. };

  59. static const int8_t quant5[256]={

  60.  0, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  61.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  62.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  63.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  64.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  65.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  66.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  67.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  68. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,

  69. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,

  70. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,

  71. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,

  72. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,

  73. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,

  74. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,

  75. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-1,-1,-1,

  76. };

  77. static const int8_t quant7[256]={

  78.  0, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  79.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  80.  2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3,

  81.  3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,

  82.  3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,

  83.  3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,

  84.  3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,

  85.  3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,

  86. -3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,

  87. -3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,

  88. -3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,

  89. -3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,

  90. -3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,

  91. -3,-3,-3,-3,-3,-3,-3,-3,-3,-2,-2,-2,-2,-2,-2,-2,

  92. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,

  93. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-1,-1,

  94. };

  95. static const int8_t quant9[256]={

  96.  0, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3,

  97.  3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  98.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  99.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  100.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  101.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  102.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  103.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  104. -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,

  105. -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,

  106. -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,

  107. -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,

  108. -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,

  109. -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,

  110. -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-3,-3,-3,-3,

  111. -3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-2,-2,-2,-2,-1,-1,

  112. };

  113. static const int8_t quant11[256]={

  114.  0, 1, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4,

  115.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  116.  4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,

  117.  5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,

  118.  5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,

  119.  5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,

  120.  5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,

  121.  5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,

  122. -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,

  123. -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,

  124. -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,

  125. -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,

  126. -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,

  127. -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-4,-4,

  128. -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,

  129. -4,-4,-4,-4,-4,-3,-3,-3,-3,-3,-3,-3,-2,-2,-2,-1,

  130. };

  131. static const int8_t quant13[256]={

  132.  0, 1, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4,

  133.  4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,

  134.  5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,

  135.  5, 5, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,

  136.  6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,

  137.  6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,

  138.  6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,

  139.  6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,

  140. -6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,

  141. -6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,

  142. -6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,

  143. -6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,

  144. -6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-5,

  145. -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,

  146. -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,

  147. -4,-4,-4,-4,-4,-4,-4,-4,-4,-3,-3,-3,-3,-2,-2,-1,

  148. };

  149. 

  150. typedef struct VlcState{

  151.     int16_t drift;

  152.     uint16_t error_sum;

  153.     int8_t bias;

  154.     uint8_t count;

  155. } VlcState;

  156. 

  157. typedef struct PlaneContext{

  158.     int context_count;

  159.     uint8_t (*state)[CONTEXT_SIZE];

  160.     VlcState *vlc_state;

  161.     uint8_t interlace_bit_state[2];

  162. } PlaneContext;

  163. 

  164. typedef struct FFV1Context{

  165.     AVCodecContext *avctx;

  166.     RangeCoder c;

  167.     GetBitContext gb;

  168.     PutBitContext pb;

  169.     int version;

  170.     int width, height;

  171.     int chroma_h_shift, chroma_v_shift;

  172.     int flags;

  173.     int picture_number;

  174.     AVFrame picture;

  175.     int plane_count;

  176.     int ac;                              ///< 1-> CABAC 0-> golomb rice

  177.     PlaneContext plane[MAX_PLANES];

  178.     int16_t quant_table[5][256];

  179.     int run_index;

  180.     int colorspace;

  181. 

  182.     DSPContext dsp;

  183. }FFV1Context;

  184. 

  185. static av_always_inline int fold(int diff, int bits){

  186.     if(bits==8)

  187.         diff= (int8_t)diff;

  188.     else{

  189.         diff+= 1<<(bits-1);

  190.         diff&=(1<<bits)-1;

  191.         diff-= 1<<(bits-1);

  192.     }

  193. 

  194.     return diff;

  195. }

  196. 

  197. static inline int predict(int_fast16_t *src, int_fast16_t *last){

  198.     const int LT= last[-1];

  199.     const int  T= last[ 0];

  200.     const int L =  src[-1];

  201. 

  202.     return mid_pred(L, L + T - LT, T);

  203. }

  204. 

  205. static inline int get_context(FFV1Context *f, int_fast16_t *src, int_fast16_t *last, int_fast16_t *last2){

  206.     const int LT= last[-1];

  207.     const int  T= last[ 0];

  208.     const int RT= last[ 1];

  209.     const int L =  src[-1];

  210. 

  211.     if(f->quant_table[3][127]){

  212.         const int TT= last2[0];

  213.         const int LL=  src[-2];

  214.         return f->quant_table[0][(L-LT) & 0xFF] + f->quant_table[1][(LT-T) & 0xFF] + f->quant_table[2][(T-RT) & 0xFF]

  215.               +f->quant_table[3][(LL-L) & 0xFF] + f->quant_table[4][(TT-T) & 0xFF];

  216.     }else

  217.         return f->quant_table[0][(L-LT) & 0xFF] + f->quant_table[1][(LT-T) & 0xFF] + f->quant_table[2][(T-RT) & 0xFF];

  218. }

  219. 

  220. static inline void put_symbol(RangeCoder *c, uint8_t *state, int v, int is_signed){

  221.     int i;

  222. 

  223.     if(v){

  224.         const int a= FFABS(v);

  225.         const int e= av_log2(a);

  226.         put_rac(c, state+0, 0);

  227. 

  228.         assert(e<=9);

  229. 

  230.         for(i=0; i<e; i++){

  231.             put_rac(c, state+1+i, 1);  //1..10

  232.         }

  233.         put_rac(c, state+1+i, 0);

  234. 

  235.         for(i=e-1; i>=0; i--){

  236.             put_rac(c, state+22+i, (a>>i)&1); //22..31

  237.         }

  238. 

  239.         if(is_signed)

  240.             put_rac(c, state+11 + e, v < 0); //11..21

  241.     }else{

  242.         put_rac(c, state+0, 1);

  243.     }

  244. }

  245. 

  246. static inline int get_symbol(RangeCoder *c, uint8_t *state, int is_signed){

  247.     if(get_rac(c, state+0))

  248.         return 0;

  249.     else{

  250.         int i, e, a;

  251.         e= 0;

  252.         while(get_rac(c, state+1 + e)){ //1..10

  253.             e++;

  254.         }

  255.         assert(e<=9);

  256. 

  257.         a= 1;

  258.         for(i=e-1; i>=0; i--){

  259.             a += a + get_rac(c, state+22 + i); //22..31

  260.         }

  261. 

  262.         if(is_signed && get_rac(c, state+11 + e)) //11..21

  263.             return -a;

  264.         else

  265.             return a;

  266.     }

  267. }

  268. 

  269. static inline void update_vlc_state(VlcState * const state, const int v){

  270.     int drift= state->drift;

  271.     int count= state->count;

  272.     state->error_sum += FFABS(v);

  273.     drift += v;

  274. 

  275.     if(count == 128){ //FIXME variable

  276.         count >>= 1;

  277.         drift >>= 1;

  278.         state->error_sum >>= 1;

  279.     }

  280.     count++;

  281. 

  282.     if(drift <= -count){

  283.         if(state->bias > -128) state->bias--;

  284. 

  285.         drift += count;

  286.         if(drift <= -count)

  287.             drift= -count + 1;

  288.     }else if(drift > 0){

  289.         if(state->bias <  127) state->bias++;

  290. 

  291.         drift -= count;

  292.         if(drift > 0)

  293.             drift= 0;

  294.     }

  295. 

  296.     state->drift= drift;

  297.     state->count= count;

  298. }

  299. 

  300. static inline void put_vlc_symbol(PutBitContext *pb, VlcState * const state, int v, int bits){

  301.     int i, k, code;

  302. //printf("final: %d ", v);

  303.     v = fold(v - state->bias, bits);

  304. 

  305.     i= state->count;

  306.     k=0;

  307.     while(i < state->error_sum){ //FIXME optimize

  308.         k++;

  309.         i += i;

  310.     }

  311. 

  312.     assert(k<=8);

  313. 

  314. #if 0 // JPEG LS

  315.     if(k==0 && 2*state->drift <= - state->count) code= v ^ (-1);

  316.     else                                         code= v;

  317. #else

  318.      code= v ^ ((2*state->drift + state->count)>>31);

  319. #endif

  320. 

  321. //printf("v:%d/%d bias:%d error:%d drift:%d count:%d k:%d\n", v, code, state->bias, state->error_sum, state->drift, state->count, k);

  322.     set_sr_golomb(pb, code, k, 12, bits);

  323. 

  324.     update_vlc_state(state, v);

  325. }

  326. 

  327. static inline int get_vlc_symbol(GetBitContext *gb, VlcState * const state, int bits){

  328.     int k, i, v, ret;

  329. 

  330.     i= state->count;

  331.     k=0;

  332.     while(i < state->error_sum){ //FIXME optimize

  333.         k++;

  334.         i += i;

  335.     }

  336. 

  337.     assert(k<=8);

  338. 

  339.     v= get_sr_golomb(gb, k, 12, bits);

  340. //printf("v:%d bias:%d error:%d drift:%d count:%d k:%d", v, state->bias, state->error_sum, state->drift, state->count, k);

  341. 

  342. #if 0 // JPEG LS

  343.     if(k==0 && 2*state->drift <= - state->count) v ^= (-1);

  344. #else

  345.      v ^= ((2*state->drift + state->count)>>31);

  346. #endif

  347. 

  348.     ret= fold(v + state->bias, bits);

  349. 

  350.     update_vlc_state(state, v);

  351. //printf("final: %d\n", ret);

  352.     return ret;

  353. }

  354. 

  355. #if CONFIG_FFV1_ENCODER

  356. static inline int encode_line(FFV1Context *s, int w, int_fast16_t *sample[2], int plane_index, int bits){

  357.     PlaneContext * const p= &s->plane[plane_index];

  358.     RangeCoder * const c= &s->c;

  359.     int x;

  360.     int run_index= s->run_index;

  361.     int run_count=0;

  362.     int run_mode=0;

  363. 

  364.     if(s->ac){

  365.         if(c->bytestream_end - c->bytestream < w*20){

  366.             av_log(s->avctx, AV_LOG_ERROR, "encoded frame too large\n");

  367.             return -1;

  368.         }

  369.     }else{

  370.         if(s->pb.buf_end - s->pb.buf - (put_bits_count(&s->pb)>>3) < w*4){

  371.             av_log(s->avctx, AV_LOG_ERROR, "encoded frame too large\n");

  372.             return -1;

  373.         }

  374.     }

  375. 

  376.     for(x=0; x<w; x++){

  377.         int diff, context;

  378. 

  379.         context= get_context(s, sample[0]+x, sample[1]+x, sample[2]+x);

  380.         diff= sample[0][x] - predict(sample[0]+x, sample[1]+x);

  381. 

  382.         if(context < 0){

  383.             context = -context;

  384.             diff= -diff;

  385.         }

  386. 

  387.         diff= fold(diff, bits);

  388. 

  389.         if(s->ac){

  390.             put_symbol(c, p->state[context], diff, 1);

  391.         }else{

  392.             if(context == 0) run_mode=1;

  393. 

  394.             if(run_mode){

  395. 

  396.                 if(diff){

  397.                     while(run_count >= 1<<ff_log2_run[run_index]){

  398.                         run_count -= 1<<ff_log2_run[run_index];

  399.                         run_index++;

  400.                         put_bits(&s->pb, 1, 1);

  401.                     }

  402. 

  403.                     put_bits(&s->pb, 1 + ff_log2_run[run_index], run_count);

  404.                     if(run_index) run_index--;

  405.                     run_count=0;

  406.                     run_mode=0;

  407.                     if(diff>0) diff--;

  408.                 }else{

  409.                     run_count++;

  410.                 }

  411.             }

  412. 

  413. //            printf("count:%d index:%d, mode:%d, x:%d y:%d pos:%d\n", run_count, run_index, run_mode, x, y, (int)put_bits_count(&s->pb));

  414. 

  415.             if(run_mode == 0)

  416.                 put_vlc_symbol(&s->pb, &p->vlc_state[context], diff, bits);

  417.         }

  418.     }

  419.     if(run_mode){

  420.         while(run_count >= 1<<ff_log2_run[run_index]){

  421.             run_count -= 1<<ff_log2_run[run_index];

  422.             run_index++;

  423.             put_bits(&s->pb, 1, 1);

  424.         }

  425. 

  426.         if(run_count)

  427.             put_bits(&s->pb, 1, 1);

  428.     }

  429.     s->run_index= run_index;

  430. 

  431.     return 0;

  432. }

  433. 

  434. static void encode_plane(FFV1Context *s, uint8_t *src, int w, int h, int stride, int plane_index){

  435.     int x,y,i;

  436.     const int ring_size= s->avctx->context_model ? 3 : 2;

  437.     int_fast16_t sample_buffer[ring_size][w+6], *sample[ring_size];

  438.     s->run_index=0;

  439. 

  440.     memset(sample_buffer, 0, sizeof(sample_buffer));

  441. 

  442.     for(y=0; y<h; y++){

  443.         for(i=0; i<ring_size; i++)

  444.             sample[i]= sample_buffer[(h+i-y)%ring_size]+3;

  445. 

  446.         sample[0][-1]= sample[1][0  ];

  447.         sample[1][ w]= sample[1][w-1];

  448. //{START_TIMER

  449.         for(x=0; x<w; x++){

  450.             sample[0][x]= src[x + stride*y];

  451.         }

  452.         encode_line(s, w, sample, plane_index, 8);

  453. //STOP_TIMER("encode line")}

  454.     }

  455. }

  456. 

  457. static void encode_rgb_frame(FFV1Context *s, uint32_t *src, int w, int h, int stride){

  458.     int x, y, p, i;

  459.     const int ring_size= s->avctx->context_model ? 3 : 2;

  460.     int_fast16_t sample_buffer[3][ring_size][w+6], *sample[3][ring_size];

  461.     s->run_index=0;

  462. 

  463.     memset(sample_buffer, 0, sizeof(sample_buffer));

  464. 

  465.     for(y=0; y<h; y++){

  466.         for(i=0; i<ring_size; i++)

  467.             for(p=0; p<3; p++)

  468.                 sample[p][i]= sample_buffer[p][(h+i-y)%ring_size]+3;

  469. 

  470.         for(x=0; x<w; x++){

  471.             int v= src[x + stride*y];

  472.             int b= v&0xFF;

  473.             int g= (v>>8)&0xFF;

  474.             int r= (v>>16)&0xFF;

  475. 

  476.             b -= g;

  477.             r -= g;

  478.             g += (b + r)>>2;

  479.             b += 0x100;

  480.             r += 0x100;

  481. 

  482. //            assert(g>=0 && b>=0 && r>=0);

  483. //            assert(g<256 && b<512 && r<512);

  484.             sample[0][0][x]= g;

  485.             sample[1][0][x]= b;

  486.             sample[2][0][x]= r;

  487.         }

  488.         for(p=0; p<3; p++){

  489.             sample[p][0][-1]= sample[p][1][0  ];

  490.             sample[p][1][ w]= sample[p][1][w-1];

  491.             encode_line(s, w, sample[p], FFMIN(p, 1), 9);

  492.         }

  493.     }

  494. }

  495. 

  496. static void write_quant_table(RangeCoder *c, int16_t *quant_table){

  497.     int last=0;

  498.     int i;

  499.     uint8_t state[CONTEXT_SIZE];

  500.     memset(state, 128, sizeof(state));

  501. 

  502.     for(i=1; i<128 ; i++){

  503.         if(quant_table[i] != quant_table[i-1]){

  504.             put_symbol(c, state, i-last-1, 0);

  505.             last= i;

  506.         }

  507.     }

  508.     put_symbol(c, state, i-last-1, 0);

  509. }

  510. 

  511. static void write_header(FFV1Context *f){

  512.     uint8_t state[CONTEXT_SIZE];

  513.     int i;

  514.     RangeCoder * const c= &f->c;

  515. 

  516.     memset(state, 128, sizeof(state));

  517. 

  518.     put_symbol(c, state, f->version, 0);

  519.     put_symbol(c, state, f->avctx->coder_type, 0);

  520.     put_symbol(c, state, f->colorspace, 0); //YUV cs type

  521.     put_rac(c, state, 1); //chroma planes

  522.         put_symbol(c, state, f->chroma_h_shift, 0);

  523.         put_symbol(c, state, f->chroma_v_shift, 0);

  524.     put_rac(c, state, 0); //no transparency plane

  525. 

  526.     for(i=0; i<5; i++)

  527.         write_quant_table(c, f->quant_table[i]);

  528. }

  529. #endif /* CONFIG_FFV1_ENCODER */

  530. 

  531. static av_cold int common_init(AVCodecContext *avctx){

  532.     FFV1Context *s = avctx->priv_data;

  533.     int width, height;

  534. 

  535.     s->avctx= avctx;

  536.     s->flags= avctx->flags;

  537. 

  538.     dsputil_init(&s->dsp, avctx);

  539. 

  540.     width= s->width= avctx->width;

  541.     height= s->height= avctx->height;

  542. 

  543.     assert(width && height);

  544. 

  545.     return 0;

  546. }

  547. 

  548. #if CONFIG_FFV1_ENCODER

  549. static av_cold int encode_init(AVCodecContext *avctx)

  550. {

  551.     FFV1Context *s = avctx->priv_data;

  552.     int i;

  553. 

  554.     common_init(avctx);

  555. 

  556.     s->version=0;

  557.     s->ac= avctx->coder_type;

  558. 

  559.     s->plane_count=2;

  560.     for(i=0; i<256; i++){

  561.         s->quant_table[0][i]=           quant11[i];

  562.         s->quant_table[1][i]=        11*quant11[i];

  563.         if(avctx->context_model==0){

  564.             s->quant_table[2][i]=     11*11*quant11[i];

  565.             s->quant_table[3][i]=

  566.             s->quant_table[4][i]=0;

  567.         }else{

  568.             s->quant_table[2][i]=     11*11*quant5 [i];

  569.             s->quant_table[3][i]=   5*11*11*quant5 [i];

  570.             s->quant_table[4][i]= 5*5*11*11*quant5 [i];

  571.         }

  572.     }

  573. 

  574.     for(i=0; i<s->plane_count; i++){

  575.         PlaneContext * const p= &s->plane[i];

  576. 

  577.         if(avctx->context_model==0){

  578.             p->context_count= (11*11*11+1)/2;

  579.         }else{

  580.             p->context_count= (11*11*5*5*5+1)/2;

  581.         }

  582. 

  583.         if(s->ac){

  584.             if(!p->state) p->state= av_malloc(CONTEXT_SIZE*p->context_count*sizeof(uint8_t));

  585.         }else{

  586.             if(!p->vlc_state) p->vlc_state= av_malloc(p->context_count*sizeof(VlcState));

  587.         }

  588.     }

  589. 

  590.     avctx->coded_frame= &s->picture;

  591.     switch(avctx->pix_fmt){

  592.     case PIX_FMT_YUV444P:

  593.     case PIX_FMT_YUV422P:

  594.     case PIX_FMT_YUV420P:

  595.     case PIX_FMT_YUV411P:

  596.     case PIX_FMT_YUV410P:

  597.         s->colorspace= 0;

  598.         break;

  599.     case PIX_FMT_RGB32:

  600.         s->colorspace= 1;

  601.         break;

  602.     default:

  603.         av_log(avctx, AV_LOG_ERROR, "format not supported\n");

  604.         return -1;

  605.     }

  606.     avcodec_get_chroma_sub_sample(avctx->pix_fmt, &s->chroma_h_shift, &s->chroma_v_shift);

  607. 

  608.     s->picture_number=0;

  609. 

  610.     return 0;

  611. }

  612. #endif /* CONFIG_FFV1_ENCODER */

  613. 

  614. 

  615. static void clear_state(FFV1Context *f){

  616.     int i, j;

  617. 

  618.     for(i=0; i<f->plane_count; i++){

  619.         PlaneContext *p= &f->plane[i];

  620. 

  621.         p->interlace_bit_state[0]= 128;

  622.         p->interlace_bit_state[1]= 128;

  623. 

  624.         for(j=0; j<p->context_count; j++){

  625.             if(f->ac){

  626.                 memset(p->state[j], 128, sizeof(uint8_t)*CONTEXT_SIZE);

  627.             }else{

  628.                 p->vlc_state[j].drift= 0;

  629.                 p->vlc_state[j].error_sum= 4; //FFMAX((RANGE + 32)/64, 2);

  630.                 p->vlc_state[j].bias= 0;

  631.                 p->vlc_state[j].count= 1;

  632.             }

  633.         }

  634.     }

  635. }

  636. 

  637. #if CONFIG_FFV1_ENCODER

  638. static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){

  639.     FFV1Context *f = avctx->priv_data;

  640.     RangeCoder * const c= &f->c;

  641.     AVFrame *pict = data;

  642.     const int width= f->width;

  643.     const int height= f->height;

  644.     AVFrame * const p= &f->picture;

  645.     int used_count= 0;

  646.     uint8_t keystate=128;

  647. 

  648.     ff_init_range_encoder(c, buf, buf_size);

  649. //    ff_init_cabac_states(c, ff_h264_lps_range, ff_h264_mps_state, ff_h264_lps_state, 64);

  650.     ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);

  651. 

  652.     *p = *pict;

  653.     p->pict_type= FF_I_TYPE;

  654. 

  655.     if(avctx->gop_size==0 || f->picture_number % avctx->gop_size == 0){

  656.         put_rac(c, &keystate, 1);

  657.         p->key_frame= 1;

  658.         write_header(f);

  659.         clear_state(f);

  660.     }else{

  661.         put_rac(c, &keystate, 0);

  662.         p->key_frame= 0;

  663.     }

  664. 

  665.     if(!f->ac){

  666.         used_count += ff_rac_terminate(c);

  667. //printf("pos=%d\n", used_count);

  668.         init_put_bits(&f->pb, buf + used_count, buf_size - used_count);

  669.     }

  670. 

  671.     if(f->colorspace==0){

  672.         const int chroma_width = -((-width )>>f->chroma_h_shift);

  673.         const int chroma_height= -((-height)>>f->chroma_v_shift);

  674. 

  675.         encode_plane(f, p->data[0], width, height, p->linesize[0], 0);

  676. 

  677.         encode_plane(f, p->data[1], chroma_width, chroma_height, p->linesize[1], 1);

  678.         encode_plane(f, p->data[2], chroma_width, chroma_height, p->linesize[2], 1);

  679.     }else{

  680.         encode_rgb_frame(f, (uint32_t*)(p->data[0]), width, height, p->linesize[0]/4);

  681.     }

  682.     emms_c();

  683. 

  684.     f->picture_number++;

  685. 

  686.     if(f->ac){

  687.         return ff_rac_terminate(c);

  688.     }else{

  689.         flush_put_bits(&f->pb); //nicer padding FIXME

  690.         return used_count + (put_bits_count(&f->pb)+7)/8;

  691.     }

  692. }

  693. #endif /* CONFIG_FFV1_ENCODER */

  694. 

  695. static av_cold int common_end(AVCodecContext *avctx){

  696.     FFV1Context *s = avctx->priv_data;

  697.     int i;

  698. 

  699.     for(i=0; i<s->plane_count; i++){

  700.         PlaneContext *p= &s->plane[i];

  701. 

  702.         av_freep(&p->state);

  703.         av_freep(&p->vlc_state);

  704.     }

  705. 

  706.     return 0;

  707. }

  708. 

  709. static inline void decode_line(FFV1Context *s, int w, int_fast16_t *sample[2], int plane_index, int bits){

  710.     PlaneContext * const p= &s->plane[plane_index];

  711.     RangeCoder * const c= &s->c;

  712.     int x;

  713.     int run_count=0;

  714.     int run_mode=0;

  715.     int run_index= s->run_index;

  716. 

  717.     for(x=0; x<w; x++){

  718.         int diff, context, sign;

  719. 

  720.         context= get_context(s, sample[1] + x, sample[0] + x, sample[1] + x);

  721.         if(context < 0){

  722.             context= -context;

  723.             sign=1;

  724.         }else

  725.             sign=0;

  726. 

  727. 

  728.         if(s->ac){

  729.             diff= get_symbol(c, p->state[context], 1);

  730.         }else{

  731.             if(context == 0 && run_mode==0) run_mode=1;

  732. 

  733.             if(run_mode){

  734.                 if(run_count==0 && run_mode==1){

  735.                     if(get_bits1(&s->gb)){

  736.                         run_count = 1<<ff_log2_run[run_index];

  737.                         if(x + run_count <= w) run_index++;

  738.                     }else{

  739.                         if(ff_log2_run[run_index]) run_count = get_bits(&s->gb, ff_log2_run[run_index]);

  740.                         else run_count=0;

  741.                         if(run_index) run_index--;

  742.                         run_mode=2;

  743.                     }

  744.                 }

  745.                 run_count--;

  746.                 if(run_count < 0){

  747.                     run_mode=0;

  748.                     run_count=0;

  749.                     diff= get_vlc_symbol(&s->gb, &p->vlc_state[context], bits);

  750.                     if(diff>=0) diff++;

  751.                 }else

  752.                     diff=0;

  753.             }else

  754.                 diff= get_vlc_symbol(&s->gb, &p->vlc_state[context], bits);

  755. 

  756. //            printf("count:%d index:%d, mode:%d, x:%d y:%d pos:%d\n", run_count, run_index, run_mode, x, y, get_bits_count(&s->gb));

  757.         }

  758. 

  759.         if(sign) diff= -diff;

  760. 

  761.         sample[1][x]= (predict(sample[1] + x, sample[0] + x) + diff) & ((1<<bits)-1);

  762.     }

  763.     s->run_index= run_index;

  764. }

  765. 

  766. static void decode_plane(FFV1Context *s, uint8_t *src, int w, int h, int stride, int plane_index){

  767.     int x, y;

  768.     int_fast16_t sample_buffer[2][w+6];

  769.     int_fast16_t *sample[2];

  770.     sample[0]=sample_buffer[0]+3;

  771.     sample[1]=sample_buffer[1]+3;

  772. 

  773.     s->run_index=0;

  774. 

  775.     memset(sample_buffer, 0, sizeof(sample_buffer));

  776. 

  777.     for(y=0; y<h; y++){

  778.         int_fast16_t *temp= sample[0]; //FIXME try a normal buffer

  779. 

  780.         sample[0]= sample[1];

  781.         sample[1]= temp;

  782. 

  783.         sample[1][-1]= sample[0][0  ];

  784.         sample[0][ w]= sample[0][w-1];

  785. 

  786. //{START_TIMER

  787.         decode_line(s, w, sample, plane_index, 8);

  788.         for(x=0; x<w; x++){

  789.             src[x + stride*y]= sample[1][x];

  790.         }

  791. //STOP_TIMER("decode-line")}

  792.     }

  793. }

  794. 

  795. static void decode_rgb_frame(FFV1Context *s, uint32_t *src, int w, int h, int stride){

  796.     int x, y, p;

  797.     int_fast16_t sample_buffer[3][2][w+6];

  798.     int_fast16_t *sample[3][2];

  799.     for(x=0; x<3; x++){

  800.         sample[x][0] = sample_buffer[x][0]+3;

  801.         sample[x][1] = sample_buffer[x][1]+3;

  802.     }

  803. 

  804.     s->run_index=0;

  805. 

  806.     memset(sample_buffer, 0, sizeof(sample_buffer));

  807. 

  808.     for(y=0; y<h; y++){

  809.         for(p=0; p<3; p++){

  810.             int_fast16_t *temp= sample[p][0]; //FIXME try a normal buffer

  811. 

  812.             sample[p][0]= sample[p][1];

  813.             sample[p][1]= temp;

  814. 

  815.             sample[p][1][-1]= sample[p][0][0  ];

  816.             sample[p][0][ w]= sample[p][0][w-1];

  817.             decode_line(s, w, sample[p], FFMIN(p, 1), 9);

  818.         }

  819.         for(x=0; x<w; x++){

  820.             int g= sample[0][1][x];

  821.             int b= sample[1][1][x];

  822.             int r= sample[2][1][x];

  823. 

  824. //            assert(g>=0 && b>=0 && r>=0);

  825. //            assert(g<256 && b<512 && r<512);

  826. 

  827.             b -= 0x100;

  828.             r -= 0x100;

  829.             g -= (b + r)>>2;

  830.             b += g;

  831.             r += g;

  832. 

  833.             src[x + stride*y]= b + (g<<8) + (r<<16);

  834.         }

  835.     }

  836. }

  837. 

  838. static int read_quant_table(RangeCoder *c, int16_t *quant_table, int scale){

  839.     int v;

  840.     int i=0;

  841.     uint8_t state[CONTEXT_SIZE];

  842. 

  843.     memset(state, 128, sizeof(state));

  844. 

  845.     for(v=0; i<128 ; v++){

  846.         int len= get_symbol(c, state, 0) + 1;

  847. 

  848.         if(len + i > 128) return -1;

  849. 

  850.         while(len--){

  851.             quant_table[i] = scale*v;

  852.             i++;

  853. //printf("%2d ",v);

  854. //if(i%16==0) printf("\n");

  855.         }

  856.     }

  857. 

  858.     for(i=1; i<128; i++){

  859.         quant_table[256-i]= -quant_table[i];

  860.     }

  861.     quant_table[128]= -quant_table[127];

  862. 

  863.     return 2*v - 1;

  864. }

  865. 

  866. static int read_header(FFV1Context *f){

  867.     uint8_t state[CONTEXT_SIZE];

  868.     int i, context_count;

  869.     RangeCoder * const c= &f->c;

  870. 

  871.     memset(state, 128, sizeof(state));

  872. 

  873.     f->version= get_symbol(c, state, 0);

  874.     f->ac= f->avctx->coder_type= get_symbol(c, state, 0);

  875.     f->colorspace= get_symbol(c, state, 0); //YUV cs type

  876.     get_rac(c, state); //no chroma = false

  877.     f->chroma_h_shift= get_symbol(c, state, 0);

  878.     f->chroma_v_shift= get_symbol(c, state, 0);

  879.     get_rac(c, state); //transparency plane

  880.     f->plane_count= 2;

  881. 

  882.     if(f->colorspace==0){

  883.         switch(16*f->chroma_h_shift + f->chroma_v_shift){

  884.         case 0x00: f->avctx->pix_fmt= PIX_FMT_YUV444P; break;

  885.         case 0x10: f->avctx->pix_fmt= PIX_FMT_YUV422P; break;

  886.         case 0x11: f->avctx->pix_fmt= PIX_FMT_YUV420P; break;

  887.         case 0x20: f->avctx->pix_fmt= PIX_FMT_YUV411P; break;

  888.         case 0x22: f->avctx->pix_fmt= PIX_FMT_YUV410P; break;

  889.         default:

  890.             av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");

  891.             return -1;

  892.         }

  893.     }else if(f->colorspace==1){

  894.         if(f->chroma_h_shift || f->chroma_v_shift){

  895.             av_log(f->avctx, AV_LOG_ERROR, "chroma subsampling not supported in this colorspace\n");

  896.             return -1;

  897.         }

  898.         f->avctx->pix_fmt= PIX_FMT_RGB32;

  899.     }else{

  900.         av_log(f->avctx, AV_LOG_ERROR, "colorspace not supported\n");

  901.         return -1;

  902.     }

  903. 

  904. //printf("%d %d %d\n", f->chroma_h_shift, f->chroma_v_shift,f->avctx->pix_fmt);

  905. 

  906.     context_count=1;

  907.     for(i=0; i<5; i++){

  908.         context_count*= read_quant_table(c, f->quant_table[i], context_count);

  909.         if(context_count < 0 || context_count > 32768){

  910.             av_log(f->avctx, AV_LOG_ERROR, "read_quant_table error\n");

  911.             return -1;

  912.         }

  913.     }

  914.     context_count= (context_count+1)/2;

  915. 

  916.     for(i=0; i<f->plane_count; i++){

  917.         PlaneContext * const p= &f->plane[i];

  918. 

  919.         p->context_count= context_count;

  920. 

  921.         if(f->ac){

  922.             if(!p->state) p->state= av_malloc(CONTEXT_SIZE*p->context_count*sizeof(uint8_t));

  923.         }else{

  924.             if(!p->vlc_state) p->vlc_state= av_malloc(p->context_count*sizeof(VlcState));

  925.         }

  926.     }

  927. 

  928.     return 0;

  929. }

  930. 

  931. static av_cold int decode_init(AVCodecContext *avctx)

  932. {

  933. //    FFV1Context *s = avctx->priv_data;

  934. 

  935.     common_init(avctx);

  936. 

  937.     return 0;

  938. }

  939. 

  940. static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt){

  941.     const uint8_t *buf = avpkt->data;

  942.     int buf_size = avpkt->size;

  943.     FFV1Context *f = avctx->priv_data;

  944.     RangeCoder * const c= &f->c;

  945.     const int width= f->width;

  946.     const int height= f->height;

  947.     AVFrame * const p= &f->picture;

  948.     int bytes_read;

  949.     uint8_t keystate= 128;

  950. 

  951.     AVFrame *picture = data;

  952. 

  953.     ff_init_range_decoder(c, buf, buf_size);

  954.     ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);

  955. 

  956. 

  957.     p->pict_type= FF_I_TYPE; //FIXME I vs. P

  958.     if(get_rac(c, &keystate)){

  959.         p->key_frame= 1;

  960.         if(read_header(f) < 0)

  961.             return -1;

  962.         clear_state(f);

  963.     }else{

  964.         p->key_frame= 0;

  965.     }

  966.     if(!f->plane[0].state && !f->plane[0].vlc_state)

  967.         return -1;

  968. 

  969.     p->reference= 0;

  970.     if(avctx->get_buffer(avctx, p) < 0){

  971.         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");

  972.         return -1;

  973.     }

  974. 

  975.     if(avctx->debug&FF_DEBUG_PICT_INFO)

  976.         av_log(avctx, AV_LOG_ERROR, "keyframe:%d coder:%d\n", p->key_frame, f->ac);

  977. 

  978.     if(!f->ac){

  979.         bytes_read = c->bytestream - c->bytestream_start - 1;

  980.         if(bytes_read ==0) av_log(avctx, AV_LOG_ERROR, "error at end of AC stream\n"); //FIXME

  981. //printf("pos=%d\n", bytes_read);

  982.         init_get_bits(&f->gb, buf + bytes_read, buf_size - bytes_read);

  983.     } else {

  984.         bytes_read = 0; /* avoid warning */

  985.     }

  986. 

  987.     if(f->colorspace==0){

  988.         const int chroma_width = -((-width )>>f->chroma_h_shift);

  989.         const int chroma_height= -((-height)>>f->chroma_v_shift);

  990.         decode_plane(f, p->data[0], width, height, p->linesize[0], 0);

  991. 

  992.         decode_plane(f, p->data[1], chroma_width, chroma_height, p->linesize[1], 1);

  993.         decode_plane(f, p->data[2], chroma_width, chroma_height, p->linesize[2], 1);

  994.     }else{

  995.         decode_rgb_frame(f, (uint32_t*)p->data[0], width, height, p->linesize[0]/4);

  996.     }

  997. 

  998.     emms_c();

  999. 

  1000.     f->picture_number++;

  1001. 

  1002.     *picture= *p;

  1003. 

  1004.     avctx->release_buffer(avctx, p); //FIXME

  1005. 

  1006.     *data_size = sizeof(AVFrame);

  1007. 

  1008.     if(f->ac){

  1009.         bytes_read= c->bytestream - c->bytestream_start - 1;

  1010.         if(bytes_read ==0) av_log(f->avctx, AV_LOG_ERROR, "error at end of frame\n");

  1011.     }else{

  1012.         bytes_read+= (get_bits_count(&f->gb)+7)/8;

  1013.     }

  1014. 

  1015.     return bytes_read;

  1016. }

  1017. 

  1018. AVCodec ffv1_decoder = {

  1019.     "ffv1",

  1020.     CODEC_TYPE_VIDEO,

  1021.     CODEC_ID_FFV1,

  1022.     sizeof(FFV1Context),

  1023.     decode_init,

  1024.     NULL,

  1025.     common_end,

  1026.     decode_frame,

  1027.     CODEC_CAP_DR1 /*| CODEC_CAP_DRAW_HORIZ_BAND*/,

  1028.     NULL,

  1029.     .long_name= NULL_IF_CONFIG_SMALL("FFmpeg codec #1"),

  1030. };

  1031. 

  1032. #if CONFIG_FFV1_ENCODER

  1033. AVCodec ffv1_encoder = {

  1034.     "ffv1",

  1035.     CODEC_TYPE_VIDEO,

  1036.     CODEC_ID_FFV1,

  1037.     sizeof(FFV1Context),

  1038.     encode_init,

  1039.     encode_frame,

  1040.     common_end,

  1041.     .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_YUV444P, PIX_FMT_YUV422P, PIX_FMT_YUV411P, PIX_FMT_YUV410P, PIX_FMT_RGB32, PIX_FMT_NONE},

  1042.     .long_name= NULL_IF_CONFIG_SMALL("FFmpeg codec #1"),

  1043. };

  1044. #endif